package com.trsj.lnsj.util;

import com.alibaba.fastjson.JSONObject;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequestUtil {
    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url   发送请求的URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param, String token) {
        String result = "";
        BufferedReader in = null;
        try {
            if (StringUtils.isNotEmpty(param)) {
                url = url + "?" + param;
            }
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();// realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("Accept-Charset", "UTF-8");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            if (StringUtils.isNotEmpty(token)) {
                connection.setRequestProperty("Authorization", token);
            }
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line == null ? "" : new String(line.getBytes(), "UTF-8");
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param, String token) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Accept-Charset", "UTF-8");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            if (StringUtils.isNotBlank(token)) {
                conn.setRequestProperty("Authorization", token);
            }
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line == null ? "" : new String(line.getBytes(), "UTF-8");
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     * post请求
     *
     * @param url
     * @param json
     * @return
     */
    public static String doPost(String url, JSONObject json) {
        String response = null;
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            HttpPost post = new HttpPost(url);
            StringEntity s = new StringEntity(json.toString());
            s.setContentEncoding("UTF-8");
            s.setContentType("application/json");// 发送json数据需要设置contentType
            post.setEntity(s);
            HttpResponse res = httpClient.execute(post);
            if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                // HttpEntity entity = res.getEntity();
                String result = EntityUtils.toString(res.getEntity());// 返回json格式：
                response = result;
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return response;
    }

    /**
     * delete请求
     *
     * @param url
     * @param token
     * @return
     */
    public static String doDelete(String url, String token) {
        String result = null;
        try {
            CloseableHttpClient client = HttpClients.createDefault();
            HttpDelete delete = new HttpDelete(url);
            delete.setHeader("Content-Type", "application/json");
            delete.setHeader("Authorization", token);
            HttpResponse res = client.execute(delete);
            if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(res.getEntity());// 返回json格式：
            } else if (res.getStatusLine().getStatusCode() == HttpStatus.SC_FORBIDDEN) {
                result = EntityUtils.toString(res.getEntity());
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return result;
    }

    /**
     * put请求
     *
     * @param url
     * @param jsonString
     * @param token
     * @return
     */
    public static String doPut(String url, String jsonString, String token) {
        String result = null;
        try {
            CloseableHttpClient client = HttpClients.createDefault();
            HttpPut put = new HttpPut(url);
            StringEntity s = new StringEntity(jsonString);
            s.setContentEncoding("UTF-8");
            put.setEntity(s);
            put.setHeader("Content-Type", "application/json");
            put.setHeader("Authorization", token);
            HttpResponse res = client.execute(put);
            if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(res.getEntity());// 返回json格式：
            } else if (res.getStatusLine().getStatusCode() == HttpStatus.SC_FORBIDDEN) {
                result = EntityUtils.toString(res.getEntity());
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return result;
    }

    /**
     * POST请求
     *
     * @param url
     * @param jsonString
     * @param token
     * @return
     */
    public static String doPost(String url, String jsonString, String token) {
        String result = null;
        try {
            CloseableHttpClient client = HttpClients.createDefault();
            HttpPost post = new HttpPost(url);
            StringEntity entity = new StringEntity(jsonString);
            entity.setContentEncoding("UTF-8");
            post.setEntity(entity);
            post.setHeader("Content-Type", "application/json");
            post.setHeader("Authorization", token);
            HttpResponse res = client.execute(post);
            if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(res.getEntity());
            } else if (res.getStatusLine().getStatusCode() == HttpStatus.SC_FORBIDDEN) {
                result = EntityUtils.toString(res.getEntity());
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return result;
    }
}
